code: def test_min_max_reduce(self):
      # GH52788
      cat = Categorical(["a", "b", "c", "d"], ordered=True)
      df = DataFrame(cat)
  
      result_max = df.agg("max")
      expected_max = Series(Categorical(["d"], dtype=cat.dtype))
      tm.assert_series_equal(result_max, expected_max)
  
      result_min = df.agg("min")
      expected_min = Series(Categorical(["a"], dtype=cat.dtype))
      tm.assert_series_equal(result_min, expected_min)
  
imports: import re
  import sys
  import numpy
  import pytest
  from pandas.compat import PYPY
  from pandas import Categorical, CategoricalDtype, DataFrame, Index, NaT, Series, date_range
  import pandas._testing
  from pandas.api.types import is_scalar
label_desc: Use image node_id 3 for calling the TestCategoricalAnalytics obj's underlying member method code with example usage: obj.test_min_max_reduce() without return types